does memcpy create a new block of memory?

This is a discussion on does memcpy create a new block of memory? within the C++ Programming forums, part of the General Programming Boards category; given two pointers : Code: int *p1; int *p2; p1 = new int[10]; memcpy(p2,p1,sizeof(p1)); I'm trying to get the program ...

  1. #1
    Registered User Diamonds's Avatar
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    Oct 2002
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    does memcpy create a new block of memory?

    given two pointers :
    Code:
    int *p1;
    int *p2;
    
    p1 = new int[10];
    
    memcpy(p2,p1,sizeof(p1));
    I'm trying to get the program to have p2 it's own memory so that if I do something like p2[0] = 1;
    p1 won't be affected.

    Does memcpy create a new memory block like that for me? If not, what does?

    <-- trying to aviod constant creation of memory

  2. #2
    samurai warrior nextus's Avatar
    Join Date
    Nov 2001
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    196

    Re: does memcpy create a new block of memory?

    Originally posted by Diamonds
    Code:
    <-- trying to aviod constant creation of memory
    well then how are you suppose to have p2 its own memory if you are trying to avoid that...well for me..i dont know much functions of other things so i write my own for loops for copying for arrays
    nextus, the samurai warrior

  3. #3
    Guest Sebastiani's Avatar
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    Waterloo, Texas
    Posts
    5,708

    Re: does memcpy create a new block of memory?

    Originally posted by Diamonds
    given two pointers :
    Code:
    int *p1;
    int *p2;
    
    p1 = new int[10];
    
    memcpy(p2,p1,sizeof(p1));
    I'm trying to get the program to have p2 it's own memory so that if I do something like p2[0] = 1;
    p1 won't be affected.

    Does memcpy create a new memory block like that for me? If not, what does?

    <-- trying to aviod constant creation of memory



    No, memcpy simply copies the contents of one chunk of memory to another.

    int a = 12, b = 75;

    memcpy(&a, &b, sizeof(int));

    cout << a << endl; // prints '75'

    cin.get();
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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